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GOODWILL AND INTANGIBLE ASSETS - SCHEDULE OF INTANGIBLE ASSETS WITH DEFINITE LIVES (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Intangible assets with definite lives    
Gross Carrying Amount $ 211,413 $ 22,603
Accumulated Amortization (36,289) (16,695)
Total $ 175,124 $ 5,908
Weighted-average useful life (years) 3 years 9 months 18 days 3 years 6 months
Contractor relationships    
Intangible assets with definite lives    
Gross Carrying Amount $ 99,497 $ 1,830
Accumulated Amortization (11,452) (495)
Total $ 88,045 $ 1,335
Weighted-average useful life (years) 3 years 4 years
Technology    
Intangible assets with definite lives    
Gross Carrying Amount $ 78,690 $ 11,377
Accumulated Amortization (14,127) (7,834)
Total $ 64,563 $ 3,543
Weighted-average useful life (years) 5 years 7 months 6 days 4 years 3 months 18 days
Memberships    
Intangible assets with definite lives    
Gross Carrying Amount $ 15,900  
Accumulated Amortization (1,340)  
Total $ 14,560  
Weighted-average useful life (years) 3 years  
Customer lists and user base    
Intangible assets with definite lives    
Gross Carrying Amount $ 12,788 $ 4,136
Accumulated Amortization (4,906) (3,432)
Total $ 7,882 $ 704
Weighted-average useful life (years) 1 year 1 year 9 months 18 days
Trade names    
Intangible assets with definite lives    
Gross Carrying Amount $ 4,538 $ 5,260
Accumulated Amortization (4,464) (4,934)
Total $ 74 $ 326
Weighted-average useful life (years) 2 years 7 months 6 days 2 years 10 months 24 days